1.visual
sense:High
quality fish meal generally consistent
color,Yellow
with reddish brown, brown or yellow-brown,
etc.Fineness
uniformity.Bad
fish meal for light yellow, bluish white or dark
brown.The
fineness and poor uniformity.Adulterated
fish meal for yellowish-white or titian, fineness and poor
uniformity.Fish
meal mixed with weathered soil color
yellow.If
except fish meal protein denaturation of be affected with damp be
affected with damp agglomerate, generally white or gray in color,
smell strong, matt.Such as
color slants deep black, have coke taste may be spontaneous burning
fishmeal.
2.sense
of smell:High
quality fish meal with a salty
smell;Inferior
fish meal has a foul smell, putrid, or
clams;Adulterated
fish meal has a light smell, grease or ammonia,
etc.If the
quantity more or the easier to distinguish adulterated
content.Fish
meal mixed cottonseed meal and
meal,Cottonseed
meal and meal, fish meal mixed with urea, slightly has the ammonia
smell.
3.sense
of touch:High-quality
fish meal hand twist YuSong shaped texture soft, no
sand;Adulteration
inferior fish meal and fish meal for fish muscle fiber content
less, feel is qualitative hard, rough mill
hands.
B. Anatomy and
microscope examination
The
general anatomical lens will samples of *0 to *0 times
amplification can distinguish, microscope magnified if necessary.
Light, such as fishmeal for brown or yellow brown by the fish, fish
bones and scales of features can be identified. Fish under the
mirror surface is rough, with fiber structure, similar to meat
powder, only light colours.Fishbone
is translucent to opaque silver body, some pieces of bones is
amber, irregular.Scales
of flat or curved transparent, with round, color depth, the scales
on the surface of fracture, crack milky
white.
The
microscopic examination of adulterated fish
meal:
1.Fish
meal of mixed meal
Fishmeal in seed coat of microscopically
mixed meal meal, the seed coat characteristic for brown, thin,
outer surface with honeycomb mesh and surface luster, the inner
surface with soft translucent white sheet
attached.Rapeseed
dregs of seed and seed kernel fragmentation from together, seed
kernel with pale yellow, irregular shape, and without
burnish.
2.Fish meal
mixed cottonseed cake
Fish
meal, microscopically with cottonseed cake in cotton fiber adhesion
on the shell, grains and cake, cotton fiber filaments for white,
hollow, flat and frizzy, translucent, luster, pieces of cotton seed
shell for brown or reddish brown,
thick.Along
the edge direction has different color of light yellow or
yellow-brown, with steps like surface. Cottonseed pieces for yellow
or yellow-brown, contain many round flat black or reddish brown oil
glands or gossypol gland.
3.Mix
fish meal of rice husk powder
Fish
meal of rice husk powder into microscopically rice husk fragments,
pieces of the surface luster and streaks of tic-tac-toe, and
visible to the shell on the surface of the
fuzz.
4.Mixed
peanut meal of fish meal
Fishmeal adding peanut meal microscopically
peanut shell and seed coat, the shell is broken, irregular, of
varying thickness of flake,
layered.Inner
white spongy, fiber interweave, outer surface is tu jin net-like,
kind of leather in red, pink, purple, or
tan.
5.Fish
meal with sesame seed cake
Fish
meal, microscopically adding sesame cake, sesame seed, sesame with
tiny circular protrusions, found on the surface of a thin, black,
brown or yellow-brown, owing to the different
varieties.
6.Mixing
soybean husk fish meal powder
Fish
meal powder adding soybean peel microscopically bean skin, yellow
or yellowish color piece.Bean
curd is concave spots, slightly curly, hilum and
visible.Microscopically
visible white spongy starch like in block the surface water
sample.
7.Blending wheat gluten
meal
Fish
powder mixed with wheat gluten microscopically in light yellow or
brown, flaky bran.The
outer surface of the bran have fine wrinkles, inner surface
adhesion starch has many opaque
white.
8.Mixed
leather meal of meal
Fish
meal powder mixed with leather microscopically in green, dark green
and red brick block or filaments, like sawdust, hydrolyzed feather
meal did not transparent.
9.Mixed
hydrolyzed feather meal of meal
Of fish
meal hydrolyzed feather meal microscopically translucent irregular
particles, some reflection.Visible
plume axis at the same time, the hollow circle. Also can see failed
to adequately hydrolyzed feather.
*0.Mix
shrimp head or shrimp meat powder, fish
meal
Fish
meal powder mixed with shrimp head microscopically in shrimp,
shrimp eyes, shrimp shell and shrimp,
etc.Similar
curly mica flakes, shrimp shell
translucent.A small
amount of shrimp meat and shrimp shell
together.Shrimp
eyes a black spherical granular, powder of shrimp head
characteristics of the more easily
recognizable.Shrimp
must exist in the microscopic as fragment, long tubular, spiral
parallel lines.Shrimp
legs as wide tubular fragment, translucent, with hair or without
hair.
*1.Mixing crab shell powder in the fish
meal
Fish
meal of crab shell powder microscopically crab shells into
features. Crab shells for pieces of the rules of the outer shell is
orange, more porous, and a honeycomb circular concave
spot.
*2.Fish
meal with shell powder
Fish
meal mixed with shell powder in microscopically shells of tiny
particles, the surface is smooth, color is different depending on
the species of shells and have bigger difference, some is white or
grey, also some in pink.Some
particles with concentric or parallel the surface of the outside
texture or a dim of wiring harness, some fragments of a jagged
rim.
*3.Mixing kelp powder in the fish
meal
Adding
kelp fish meal powder microscopically light grey and have yellow
spots between lamellar particles, the size, shape, and highly
irregular.
